Gerhard Richter's Abstraktes Bild 776-1 (Abstract Painting) is valued at £1.8m-2.2m ($2.9m-3.6m) ahead of a contemporary art evening sale at Phillips in London on February 10.
The circa 1992 painting is one of a number the artist created using a squeegee, which creates abstract bands of colour of extraordinary richness and depth.
Richter's auction record was set at $37.1m for Domplatz, Mailand at Sotheby's New York in May 2013. You can read Wikicollecting's top 10 most valuable Gerhard Richter paintings sold at auction here.
An untitled painting by Christopher Wool carries an estimate of £800,000-1.2m ($1.3m-1.9m).
The work dates to 2005, and was created in part with the use of a spray gun filled with paint.
Wool's most desirable pieces are his "word" paintings, which date to the late 1980s and feature large pronouncements in stencil. His later work, including the example in the sale, is essentially a revival of the great New York abstract tradition.
Wool's auction record was set at $26.4m for Apocalypse Now (1988) at Christie's New York in November 2013.
We have a range of art and photography memorabilia available, including this signed original work from Damien Hirst.
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